Double-acting pump



Feb. l 1927.

E. J. SHEARER DOUBLE ACTING PUMP Filed Oct. 22. 1925 A /x/VE/w ro/e, Md

ZIJ/gapen Patented Feb. 1, 1927.

nire srrs Mieli tries.

earner DOUBLE-ACTNG PUMP.

Application filed October 22. 1925. Serial No. 64110.

This invention relates to deep well pumps and has for its principalobject the provision of a pump that will raise iiuid on both strokes sothat the production of a well may be doubled.

Another object of the invention 1s to provide a .double act/iup` pumpconstruction which permits oi2 the use of the simple, long lived ballvalves, such as are preferred in oil well pumps.

Another objectof the invention is to provide a pump that is readilyassembled, or taken down for repair or replacement ot' parts, in whichpump, the' valves and valve seats are readily renewed.

Another object of the invention is to provide an improved piston orplunger for double acting pumps.

Another object of the invention is to provide a pump, particularlyadapted for oil wells, in which protected trom sand which may settledown upon the pump from the tubing above.

Another object, of the invention is to provid-e a double acting` pumpthat is not appreciably greater in cost than a single acting pump of thesame general construction.

Still other objects and advantages of my invention will appearhereinafter.

I have illustrated my invention by the accon'ipanying drawings in whichI have illustrated one practica-l embodiment of my invention.

ln the said drawings Fig. l is a vertical mid section oit `the saidembodiment, the parts in this view beingl shown in the respective.positions they assume during` the up stroke of the plunger.

ll 2 the saine but with the parts .in the positions they assume on thedown stroke. l

Fig'. 3 is a cross section on a. line 3-3 0f Fig. l.V

Fig. d is a cross section on a line 4 4.- ot' Fig. l.

In carrying` out my invention in the embodiment illustrated I providethe tubular pump casing or jacket 5 externally threaded at each end at 6and 7. At the lower end of the jacket there is provided a cup-like'fitting S having` a coaxial inlet opening' 9. Over the opening, thereis fitted a valve cage l0, the hitting provides an integral seat llunder the cage. Hthin the cage, there is disposed the standing valve 12adapted to4 pump, the plunger is well.

rest upon the seat ll to prevent return flow or' fluid through theopening 9. l

Vfithin the jacket, there is provided reciprocal plunger ld that will befurther' described herenafter. Said plunger includes a working1 valveseat member 15 hired relative to a working valve cage member 16. Fromthem-einher 16, there is continued a plunger tub-e 18 that is iitted attheupper end with a ring 19 to which the pump rods (not shown.) may beattached. The plunger tube provides a bore 2O vthrough which iuid mayrise, and the upper endv of the tube is provided with perforations 2l,for the escape of the fluid.

lt' will be apparent now that the plunger and its working` valvewillcoact with the jacket and standing valve in the same manner in whichlike parts cooperatein the usual .single acting; pump. As the plungerascends, it draws luidtluough the standing valve, and raises thefluid-that isjabove the working. valve.

To make the pump, double acting, l provide an upper coupling 22 'thatincludes'intake balls and seats 23 and 24 respectively, and dischargeballs and seats 25, and 26 respectively. two chambers 23a and 25a, by awall 27.' Both chambers lead upwardv through the coupling as at 23" and25". Thecoupling connects the jacket to the tubingv 27, through whichfiuid is carried to the surface. rlhe coupling` is provided with aplurality of discharge ports 29, iutorwhich are screw seatedv the valveseats 26.

Above each discharge port, .integral iingers 3l are provided to form'v acage' Vfor the corresponding ball, to limit lits upward movement.' andto allow fluid to pass while the ball is in the position Ashown 'in Fig. l. lnletports 32 arealso provided in the coupling. Saidy ports openIfrom the side of' the couplingand lead downwardlythrough the coupling;and through the inlet chamber. For each inlet port, there is providedthe integral seat 241, and below each inlet port, a ling'ered cage 34 isscrew-threaded into the coupling. The inlet seats are so arranged thatthey may be ground by passing a tool through the underlying' cage andcausing' it to Work against the valve seat. The discharge valve seatsare removable for grinding or replacement.

The plunger tube is a close working tit The coupling` is divided intolesV los

screws 41a. The working valve ball Ll2 is placed in its cage before theseat and cup parts of the lower part of Y decreases,

leather are secured by the screws L11. All plunger are readily removedfor inspection, repair or replacement, and the upper coupling is alsoreadily removed from the pump for inspection, repair or replacement ofthe ballsand seats.

In the operation of the pump, the plunger is first raised to accomplishits upstroke, the parts assuming the position shown in Fig. 1. As theplunger rises, fluid is drawn into the the main pump chamber, throughthe standing valve and inlet port 9. During the upstroke, fluid abovethe working valve is forced upward through the discharge valve asindicated by the arrows. Then the plunger first moves upwardly,the fluiddrives the intake balls up against their seats, as shown in Fig. 1, thuspreventing the fluid from being forced back into the well. During the upstroke of the plunger, the working valve is closed.

lVhen the plunger' descends, the standing valve closes and all fluidbelow the plunger is trapped. As the space below the plunger thedisplaced fluid rises through the working valve and the plunger tube,and enters the tubing above the pump through the perforations. Y

It will be apparent now that fiuid is raised through the tubing on bothstrokes of the plunger. When the plunger is descending, the dischargevalves in the coupling close and a pressure diminution is created in thepump chamber above the descending plunger. This induces fluid throughthe inlet ports and valves so that the pump draws oil from the well onthe downstroke of the plunger as well as on the upstroke.

It will be apparent now that each stroke of the plunger draws Huid fromthe well, and each stroke also impels fluid upward through the tubingand the pump is therefor truly double acting and of double the capacityof the same size of single acting pump.

lt sometimes happens that when an oil well has been pumped foi1 awhileand the operation of the pump has been discontinued that the well startsto flow, and in this event, oil will pass ball check 23 and when the oildevelops sufficient pressure, ball check 25 will be lifted from its seatto permit the oil to flow upward into and through tube 27. Likewise thepressure of the oil will force ball checks 12 and 4t2 off their seats soas to permit the oil to flow upward through duct 20 in piston rod 21.

Thus it will be seen that l have provided an economical, readilyassembled, double acting pump of simple construction, adapted to liftand discharge fluid on both of its strokes, and, while I have shown anddescribed a specific embodiment of my invention, l do not limit myselfto any specific construction or arrangement of parts and may alter theconstruction and arrangement of parts as I desire, without enlarging thescope of my invention, as set forth in the appended claim.

I claim as my invention:

In a double acting pump, a cylinder, an inwardly opening ball checkvalve at the lower end thereof, a hollow fitting at the upper end ofsaid cylinder, the lower portion of the chamber within said fittingbeing divided by a diametrically arranged partition, a plurality of ballvalve seats removably seated in the lower portion of said litting on oneside of the partition therein, downwardly seating ball check valvesadapted to rest on said valve seats, a plurality of upwardly seatingball check valves arranged within the chamber on the other side of saidpartition, a lingered cage removably seated in the lower portion of thefitting beneath each upwardly seating ball chock valve, a pistonarranged for operation within the cylinder and a tubular piston rodconnected to said piston and extending upwardly through the center ofsaid fitting between the chambers that are formed in the lower portionthereof.

In testimony whereof I affix my signature.

EDWARD J. SHEARER.

